Project description:The goal of this experiment is to evaluate the potential for utilising this oligonucleotide microarray in other species and genera of the Pinaceae family by using comparative RNA hybridizations in four different spruces (Picea spp), two pines (Pinus spp.) and a larch (Larix laricina), across two tissues, xylem and phelloderm. One-color comparison of 7 conifer species in 2 tissue types: xylem and phelloderm. Between 4 and 28 biological repetitions per sample type, depending on the species, for a total of 142 slides.
Project description:We report the discovery of a beta-glucosidase gene (PgM-NM-2glu-1) whose expression underpins natural resistance to a major forest pest, the spruce budworm (SBW) in white spruce (Picea glauca (Voss.) Moench). We performed a microarray experiment to compare resistant (R) and non-resistant (N-R) trees. PgM-NM-2glu-1 transcripts levels uniquely were up to 1000 times higher in phenotypically resistant trees and correlated with accumulation of acetophenones compounds that reduce SBW development. These resistance traits were heritable, temporally correlated with the emergence of the most damaging larval stages and were highly variable in the natural population across a large geographic area. The recombinant gene product specifically catalyzed the release of biologically active acetophenones from their glucoside precursors. SBW outbreaks have become more frequent and intense; therefore, the phenotypic diversity resulting from variation in PgM-NM-2glu-1 expression may be a key for the adaptability of spruce populations. Transcriptome profiling was carried out with needles from 7 resistant and 7 non-resistant trees (harvested on June 17th, 2010), and 3 samples per tree (n=42) with a custom microarray developed for spruce species and comprising oligonucleotide probes for 23,853 unique P. glauca gene sequences (Raherison et al., 2012).
Project description:The goal is to identify tissue specific patterns of expression in Picea glauca seedlings One-color comparison of seven tissues of white spruce. Four biological repetitions per tissue (non-related trees), repeated in two channels as technical replicates, for a total of 56 slides.
Project description:The goal is to examine the molecular aspects underpinning somatic embryogenesis (SE) within shoot tissues of adult white spruce trees by conducting transcriptome-wide expression profiling of shoot explants taken from responsive and nonresponsive genotypes. One-color analysis of vegetative buds in somatic embryogenesis responsive and nonresponsive genotypes, before and after 7 days of SE induction. There are 5 biological replicates for each of the 4 combinations of genotype/time of induction for a total of 20 slides. Each replicate is comprised of a pool of 6 buds.
Project description:The goal is to look at changes in the pattern of expression of the xylem transcriptome through the growth season in two spruces (Picea glauca and Picea abies). One-color comparison of active xylem collected in June, July, August and September, in two spruce species. Six biological repetitions per time point and specie, for a total of 48 slides.
Project description:The goal of this experiment is to assess tissue preferential transcript accumulation and fold difference between two tissues that support secondary vascular growth in three spruces: Picea glauca, Picea sitchensis and Picea mariana. Tissues compared are secondary xylem (wood forming tissue located on the internal side of the cambial meristem) and phelloderm (composite sample of the phloem and phelloderm tissues located on the outer side of the cambial meristem). One-color comparison of 3 spruce species in 2 tissue types: xylem and phelloderm. 20 biological repetitions per tissue for Picea glauca and 15 for Picea sitchensis and Picea mariana, for a total of 100 slides.